BMP183 SPI Barometric Pressure & Altitude Sensor

Bosch BMP183 SPI barometric pressure and temperature sensor breakout; functionally equivalent to the BMP180 with 0.25 m altitude noise but uses SPI instead of I2C. On-board 3.3 V regulator and SPI level shifter for 3–5 V systems.

Logical pinout · physical placement not verified

Vin
Power input. Adafruit states the board regulator takes 3-5VDC and should be powered at the microcontroller logic level.
Type · PowerVoltage · 3-5VDC input, use the same logic level as the microcontroller
3Vo
3.3V output from the onboard voltage regulator. Adafruit states up to 100mA can be drawn.
Type · PowerVoltage · 3.3V output, up to 100mA
GND
Common ground for power and logic.
Type · GroundVoltage · 0V
SCK
SPI clock input to the BMP183. Adafruit states SPI logic pins are 3-5V logic-level safe and use the Vin logic level.
Type · SPIVoltage · 3-5V logic, follows Vin
SDO
Serial Data Out, microcontroller-in sensor-out, data sent from the BMP183 to the processor.
Type · SPIVoltage · 3-5V logic, follows Vin
SDI
Serial Data In, microcontroller-out sensor-in, data sent from the processor to the BMP183.
Type · SPIVoltage · 3-5V logic, follows Vin
CS
Chip Select input. Adafruit states to drop it low to start an SPI transaction.
Type · SPIVoltage · 3-5V logic, follows Vin

Pin	Type	Function	Voltage
Vin	Power	Power input. Adafruit states the board regulator takes 3-5VDC and should be powered at the microcontroller logic level.	3-5VDC input, use the same logic level as the microcontroller
3Vo	Power	3.3V output from the onboard voltage regulator. Adafruit states up to 100mA can be drawn.	3.3V output, up to 100mA
GND	Ground	Common ground for power and logic.	0V
SCK	SPI	SPI clock input to the BMP183. Adafruit states SPI logic pins are 3-5V logic-level safe and use the Vin logic level.	3-5V logic, follows Vin
SDO	SPI	Serial Data Out, microcontroller-in sensor-out, data sent from the BMP183 to the processor.	3-5V logic, follows Vin
SDI	SPI	Serial Data In, microcontroller-out sensor-in, data sent from the processor to the BMP183.	3-5V logic, follows Vin
CS	SPI	Chip Select input. Adafruit states to drop it low to start an SPI transaction.	3-5V logic, follows Vin

Logical pinout · physical placement not verified

Pin details

7 connections

Vin
Power input. Adafruit states the board regulator takes 3-5VDC and should be powered at the microcontroller logic level.
PowerVoltage · 3-5VDC input, use the same logic level as the microcontroller
3Vo
3.3V output from the onboard voltage regulator. Adafruit states up to 100mA can be drawn.
PowerVoltage · 3.3V output, up to 100mA
GND
Common ground for power and logic.
GroundVoltage · 0V
SCK
SPI clock input to the BMP183. Adafruit states SPI logic pins are 3-5V logic-level safe and use the Vin logic level.
SPIVoltage · 3-5V logic, follows Vin
SDO
Serial Data Out, microcontroller-in sensor-out, data sent from the BMP183 to the processor.
SPIVoltage · 3-5V logic, follows Vin
SDI
Serial Data In, microcontroller-out sensor-in, data sent from the processor to the BMP183.
SPIVoltage · 3-5V logic, follows Vin
CS
Chip Select input. Adafruit states to drop it low to start an SPI transaction.
SPIVoltage · 3-5V logic, follows Vin

Start wiring

I2C · SPI · Single data line · 3.3 – 5 V · Breakout

Confirm the data interface matches your host board.

Module pins: Vin, 3Vo, GND, SCK, SDO, SDI, CS. Schematik maps them to your board in the app.

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